Life In 19x19 :: 4 LD's from 1001 L&D problems

My initial impression was:

b is the easiest, then d, then c then a.

b looks like a one move problem, and after :b1:

I can't see a move for w:

Click Here To Show Diagram Code: [go]$$c $$ +---------------------------+ $$ | . . . O . . . . . X O X O | $$ | O O . . . X . . . X O . . | $$ | O X O O O X . . . X O . X | $$ | X X X X X X , . . X O . . | $$ | . . . . d . . . c X O O . | $$ | . . . . . . . . . . X O . | $$ | . . . , . . , . . , X X X | $$ | . . . . . . . . . . . . . | $$ | . . X X a . . . b . X X X | $$ | . X O X . . , . X , X O O | $$ | . . . O X X . . X . O O . | $$ | O . O . O X . . X O . 1 . | $$ | . . . . O X . . X X O . . | $$ +---------------------------+[/go]

d looks easy, because there don't seem to be many possibilities. However it is a shortage of liberties problem, and I would have missed my solution in a game. both :b1:

and

are forcing moves and after :b5:

w can't connect:

Click Here To Show Diagram Code: [go]$$c $$ +---------------------------+ $$ | . 2 1 M 5 . . . . X O X O | $$ | O O . 3 4 X . . . X O . . | $$ | O X O O O X . . . X O . X | $$ | X X X X X X , . . X O . . | $$ | . . . . d . . . c X O O . | $$ | . . . . . . . . . . X O . | $$ | . . . , . . , . . , X X X | $$ | . . . . . . . . . . . . . | $$ | . . X X a . . . b . X X X | $$ | . X O X . . , . X , X O O | $$ | . . . O X X . . X . O O . | $$ | O . O . O X . . X O . . . | $$ | . . . . O X . . X X O . . | $$ +---------------------------+[/go]

c looked harder, but when I tried it, it was pretty easy. After seeing that the obvious move at m12 fails, I tried the hane at :b1:

At first I though w could get a ko with :w2:

and

, but

does away with that hope:

Click Here To Show Diagram Code: [go]$$c $$ +---------------------------+ $$ | . . . O . . . . . X O X M | $$ | O O . . . X . . . X O . 5 | $$ | O X O O O X . . . X O 4 X | $$ | X X X X X X , . . X O . 2 | $$ | . . . . d . . . c X O O 3 | $$ | . . . . . . . . . . X O 1 | $$ | . . . , . . , . . , X X X | $$ | . . . . . . . . . . . . . | $$ | . . X X a . . . b . X X X | $$ | . X O X . . , . X , X O O | $$ | . . . O X X . . X . O O . | $$ | O . O . O X . . X O . . . | $$ | . . . . O X . . X X O . . | $$ +---------------------------+[/go]

a looked difficult because kos seem to pop up everywhere, and although "a" looks like it can do something evil, I couldn't find a solution without ko.

Click Here To Show Diagram Code: [go]$$c $$ +---------------------------+ $$ | . . . O . . . . . X O X O | $$ | O O . . . X . . . X O . . | $$ | O X O O O X . . . X O . X | $$ | X X X X X X , . . X O . . | $$ | . . . . d . . . c X O O . | $$ | . . . . . . . . . . X O . | $$ | . . . , . . , . . , X X X | $$ | . . . . . . . . . . . . . | $$ | . . X X a . . . b . X X X | $$ | . X O X . . , . X , X O O | $$ | . . . O X X . . X . O O . | $$ | O . O . O X . . X O . . . | $$ | . . a . O X . . X X O . . | $$ +---------------------------+[/go]

So, after trying b is easier than c which is easier than d which is easier than a.

Author:	cyclops [ Thu Feb 17, 2011 11:05 am ]
Post subject:	4 LD's from 1001 L&D problems
Black to move: Find the first 5 moves of the main-variant that kills W unconditionally or in double ko. If there are more solutions find the most profitable or most simple one. I publish the ( book ) solutions after 10 days. Difficulty: sdk Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . . . O . . . . . X O X O \| $$ \| O O . . . X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O . . . \| $$ \| . . . . O X . . X X O . . \| $$ +---------------------------+[/go] I'm interested in how you estimate the difficulty of each problem. So I look forward to reactions like: b > a = d > c ( c is easiest ) or b = 500 s, a = d = 100 s, d = 40 s. ( for this 7 kyu, s for seconds ) or b = 4 k, a = d = 6k, d = 8k. I recommend the book "One thousand and one Life-and-Death problems" by Richard Bozulich, Kiseido Publishing Company.

Author:	Mnemonic [ Thu Feb 17, 2011 11:35 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
Because I'm only a 10k I only looked at the easiest problem and after some time I think I found the solution. It took me about 90 seconds and I'm pretty certain I wouldn't have seen it in a real game Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . 5 1 O . . . . . X O X O \| $$ \| O O 2 4 3 X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O . . . \| $$ \| . . . . O X . . X X O . . \| $$ +---------------------------+[/go] I am probably closer to 9k than 10k and I found this problem challenging but doable so the estimate of 8k sounds reasonable

Author:	jts [ Thu Feb 17, 2011 11:59 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . 4 1 O . . . . . X O X O \| $$ \| O O 2 5 3 X . . . X O 3 5 \| $$ \| O X O O O X . . . X O 4 X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O 2 \| $$ \| . . . . . . . . . . X O 1 \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X 3 O O . \| $$ \| O 2 O . O X . . X O . 2 1 \| $$ \| . 1 3 . O X . . X X O . . \| $$ +---------------------------+[/go] Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . . 1 O . . . . . X O X O \| $$ \| O O 3 . 2 X . . . X O 2 . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O 3 \| $$ \| . . . . . . . . . . X O 1 \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . 5 O X X . . X 2 O O . \| $$ \| O . O 3 O X . . X O . 3 1 \| $$ \| . 1 2 4 O X . . X X O . . \| $$ +---------------------------+[/go] d= 1min, c= 1min (but then when doing the diagram I forgot the main line and spent 10 minutes trying to find a different solution...), b= 3 min, a=5 min

Author:	Dusk Eagle [ Thu Feb 17, 2011 3:02 pm ]
Post subject:	Re: 4 LD's from 1001 L&D problems
Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . . 1 O . . . . . X O X O \| $$ \| O O 3 . 2 X . . . X O 3 . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . . . . . . X O O 2 \| $$ \| . . . . . . . . . . X O 1 \| $$ \| . . . , . . , . . , X X X \| $$ \| . 7 . . . . . . . . . . . \| $$ \| . 6 X X . . . . . . X X X \| $$ \| 8 X O X . . , . X , X O O \| $$ \| . 2 4 O X X . . X 3 O O . \| $$ \| O 9 O 3 O X . . X O . 2 1 \| $$ \| . 5 1 . O X . . X X O . . \| $$ +---------------------------+[/go] Assuming I got them all right, I think they're all around equal difficulty, about the range for me where it's pretty quick to solve them as problems but I might take a bit during the game, depending on how I was feeling. I suppose the bottom-left was the hardest, as I tried the most points before finding the right (?) one and white can resist a bit stronger than in the other corners. Edit: Derp, I read out at in the lower left, but somehow misevaluated it. That was stupid of me.

Author:	Sverre [ Thu Feb 17, 2011 3:12 pm ]
Post subject:	Re: 4 LD's from 1001 L&D problems
cyclops wrote: Black to move: Find the first 5 moves of the main-variant that kills W unconditionally or in double ko. If there are more solutions find the most profitable or most simple one. I publish the ( book ) solutions after 10 days. Difficulty: sdk Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . 2 1 O 5 . . . . X O X O \| $$ \| O O . 3 4 X . . . X O 4 3 \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . 2 \| $$ \| . . . . d . . . c X O O 5 \| $$ \| . . . . . . . . . . X O 1 \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . 1 . O X X . . X 3 O O . \| $$ \| O 2 O 5 O X . . X O 5 2 1 \| $$ \| . 3 4 . O X . . X X O . 4 \| $$ +---------------------------+[/go] c > a > d > b @Dusk Eagle: Click Here To Show Diagram Code `[go]$$ $$ \| . . . . . . . $$ \| . . X X . . . $$ \| . X O X . . , $$ \| . . . O X X . $$ \| O . O . O X . $$ \| . 2 1 . O X . $$ +--------------[/go]` @jts Click Here To Show Diagram Code `[go]$$ Do you have a plan to refute this W 2? $$ \| . . . . . . . $$ \| . . X X a . . $$ \| . X O X . . , $$ \| . 2 . O X X . $$ \| O . O . O X . $$ \| . 1 . . O X . $$ +--------------[/go]`

Life In 19x19 http://www.lifein19x19.com/

4 LD's from 1001 L&D problems http://www.lifein19x19.com/viewtopic.php?f=15&t=3229	Page 1 of 1

Author:	jts [ Thu Feb 17, 2011 4:02 pm ]
Post subject:	Re: 4 LD's from 1001 L&D problems
@sverre: didn't see that!

Author:	hyperpape [ Thu Feb 17, 2011 4:21 pm ]
Post subject:	Re: 4 LD's from 1001 L&D problems
I was going to say d<a< b < c where spacing denotes how close they are in difficulty. However, I uh...got d wrong . I got a and b right, at least if sverre is right. I could not solve c. I think the double ko bit was something of a hint. I'm really awful at tsumego.

Author:	cyclops [ Thu Feb 17, 2011 7:08 pm ]
Post subject:	Re: 4 LD's from 1001 L&D problems
If you want to see the solutions: check Sverre. But they are not the only correct ones.

Author:	daal [ Fri Feb 18, 2011 3:25 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
My initial impression was: b is the easiest, then d, then c then a. b looks like a one move problem, and after I can't see a move for w: Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . . . O . . . . . X O X O \| $$ \| O O . . . X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O . 1 . \| $$ \| . . . . O X . . X X O . . \| $$ +---------------------------+[/go] d looks easy, because there don't seem to be many possibilities. However it is a shortage of liberties problem, and I would have missed my solution in a game. both and are forcing moves and after w can't connect: Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . 2 1 M 5 . . . . X O X O \| $$ \| O O . 3 4 X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O . . . \| $$ \| . . . . O X . . X X O . . \| $$ +---------------------------+[/go] c looked harder, but when I tried it, it was pretty easy. After seeing that the obvious move at m12 fails, I tried the hane at At first I though w could get a ko with and , but does away with that hope: Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . . . O . . . . . X O X M \| $$ \| O O . . . X . . . X O . 5 \| $$ \| O X O O O X . . . X O 4 X \| $$ \| X X X X X X , . . X O . 2 \| $$ \| . . . . d . . . c X O O 3 \| $$ \| . . . . . . . . . . X O 1 \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O . . . \| $$ \| . . . . O X . . X X O . . \| $$ +---------------------------+[/go] a looked difficult because kos seem to pop up everywhere, and although "a" looks like it can do something evil, I couldn't find a solution without ko. Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . . . O . . . . . X O X O \| $$ \| O O . . . X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O . . . \| $$ \| . . a . O X . . X X O . . \| $$ +---------------------------+[/go] So, after trying b is easier than c which is easier than d which is easier than a.

Author:	topazg [ Fri Feb 18, 2011 3:33 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
daal wrote: My initial impression was: b is the easiest, then d, then c then a. b looks like a one move problem, and after I can't see a move for w: Click Here To Show Diagram Code [go]$$c $$ +---------------------------+ $$ \| . . . O . . . . . X O X O \| $$ \| O O . . . X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O . 1 . \| $$ \| . . . . O X . . X X O . . \| $$ +---------------------------+[/go] Click Here To Show Diagram Code [go]$$c "a" and "b" miai for White life? $$ +---------------------------+ $$ \| . . . O . . . . . X O X O \| $$ \| O O . . . X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O b 1 2 \| $$ \| . . . . O X . . X X O a . \| $$ +---------------------------+[/go]

Author:	topazg [ Fri Feb 18, 2011 3:51 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
Sverre wrote: @jts Click Here To Show Diagram Code `[go]$$ Do you have a plan to refute this W 2? $$ \| . . . . . . . $$ \| . . X X a . . $$ \| . X O X . . , $$ \| . 2 . O X X . $$ \| O . O . O X . $$ \| . 1 . . O X . $$ +--------------[/go]` Click Here To Show Diagram Code `[go]$$ goes running, but the corner dies $$ \| . 6 . . . . . $$ \| . 4 X X a . . $$ \| 5 X O X . . , $$ \| . 2 8 O X X . $$ \| O 9 O 7 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Click Here To Show Diagram Code `[go]$$ It all dies $$ \| . 7 . . . . . $$ \| 6 4 X X a . . $$ \| 5 X O X . . , $$ \| 8 2 . O X X . $$ \| O . O 9 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Click Here To Show Diagram Code `[go]$$ It dies here too $$ \| . . . . . . . $$ \| . 5 X X a . . $$ \| . X O X . . , $$ \| . 2 . O X X . $$ \| O . O 4 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Does this work?

Author:	Sverre [ Fri Feb 18, 2011 4:06 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
topazg wrote: Click Here To Show Diagram Code `[go]$$ goes running, but the corner dies $$ \| . 6 . . . . . $$ \| . 4 X X a . . $$ \| 5 X O X . . , $$ \| . 2 8 O X X . $$ \| O 9 O 7 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Does this work? Yes, that seems to work. I hadn't read the continuation out beyond thoroughly.

Author:	cyclops [ Fri Feb 18, 2011 4:54 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
Sverre wrote: topazg wrote: Click Here To Show Diagram Code `[go]$$ goes running, but the corner dies $$ \| . 6 . . . . . $$ \| . 4 X X a . . $$ \| 5 X O X . . , $$ \| . 2 8 O X X . $$ \| O 9 O 7 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Does this work? Yes, that seems to work. I hadn't read the continuation out beyond thoroughly. I usually come up with the most complicated solution, so I have In Topasz' last diagram: 3 @ 7. Does this work?

Author:	daal [ Fri Feb 18, 2011 4:55 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
topazg wrote: Click Here To Show Diagram Code [go]$$c "a" and "b" miai for White life? $$ +---------------------------+ $$ \| . . . O . . . . . X O X O \| $$ \| O O . . . X . . . X O . . \| $$ \| O X O O O X . . . X O . X \| $$ \| X X X X X X , . . X O . . \| $$ \| . . . . d . . . c X O O . \| $$ \| . . . . . . . . . . X O . \| $$ \| . . . , . . , . . , X X X \| $$ \| . . . . . . . . . . . . . \| $$ \| . . X X a . . . b . X X X \| $$ \| . X O X . . , . X , X O O \| $$ \| . . . O X X . . X . O O . \| $$ \| O . O . O X . . X O b 1 2 \| $$ \| . . . . O X . . X X O a . \| $$ +---------------------------+[/go] I didn't see that "b" was a self atari I can't find anything that doesn't end in ko I guess I have to revise my list: a hardest, b ???, d hard, c manageable.

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Author:	topazg [ Fri Feb 18, 2011 5:15 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
daal wrote: I didn't see that "b" was a self atari I can't find anything that doesn't end in ko I guess I have to revise my list: a hardest, b ???, d hard, c manageable. Spoiler hint about "b": It is ko ... twice Full Spoiler about "b": Click Here To Show Diagram Code `[go]$$c If @ , then @ kills $$ \| . . . . . . . . . . . . . \| $$ \| . . . . . . . . . . X X X \| $$ \| . . . , . . , . X , X O O \| $$ \| . . . . . . . . X 3 O O . \| $$ \| . . . . . . . . X O 5 2 1 \| $$ \| 6 . . . . . . . X X O . 4 \| $$ +---------------------------+[/go]` Click Here To Show Diagram Code `[go]$$c $$ \| . . . . . . . . . . . . . \| $$ \| . . . . . . . . . . X X X \| $$ \| . . . , . . , . X , X O O \| $$ \| . . . . . . . . X X O O . \| $$ \| 4 5 . . . . . . X 2 7 O X \| $$ \| O 1 . . . . . . X X O 3 6 \| $$ +---------------------------+[/go]` It's a double ko. It doesn't matter how many threats White creates, Black can just capture the other ko.

Author:	jts [ Fri Feb 18, 2011 8:37 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
topazg wrote: Sverre wrote: @jts Click Here To Show Diagram Code `[go]$$ Do you have a plan to refute this W 2? $$ \| . . . . . . . $$ \| . . X X a . . $$ \| . X O X . . , $$ \| . 2 . O X X . $$ \| O . O . O X . $$ \| . 1 . . O X . $$ +--------------[/go]` Click Here To Show Diagram Code `[go]$$ goes running, but the corner dies $$ \| . 6 . . . . . $$ \| . 4 X X a . . $$ \| 5 X O X . . , $$ \| . 2 8 O X X . $$ \| O 9 O 7 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Click Here To Show Diagram Code `[go]$$ It all dies $$ \| . 7 . . . . . $$ \| 6 4 X X a . . $$ \| 5 X O X . . , $$ \| 8 2 . O X X . $$ \| O . O 9 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Click Here To Show Diagram Code `[go]$$ It dies here too $$ \| . . . . . . . $$ \| . 5 X X a . . $$ \| . X O X . . , $$ \| . 2 . O X X . $$ \| O . O 4 O X . $$ \| . 1 3 . O X . $$ +--------------[/go]` Does this work? Thanks for defending my honor!

Author:	Tommie [ Fri Feb 18, 2011 9:51 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
cyclops wrote: Black to move: Find the first 5 moves of the main-variant that kills W unconditionally or in double ko. If there are more solutions find the most profitable or most simple one. I publish the ( book ) solutions after 10 days. Difficulty: sdk I'm interested in how you estimate the difficulty of each problem. So I look forward to reactions like: b > a = d > c ( c is easiest ) or b = 500 s, a = d = 100 s, d = 40 s. ( for this 7 kyu, s for seconds ) or b = 4 k, a = d = 6k, d = 8k. (...) 1s 5s 2s 10s d < c < b < a (whereas in a, I wanted to start with a2, but now, with hindsight, b3 is much cleaner)

Author:	unkx80 [ Fri Feb 18, 2011 10:52 am ]
Post subject:	Re: 4 LD's from 1001 L&D problems
I found c the hardest, because I have seen all of the rest before. The first move in c took me a while to find.

Author:	cyclops [ Fri Feb 18, 2011 6:21 pm ]
Post subject:	Re: 4 LD's from 1001 L&D problems
evaluation together we find a and c the hardest, and d the easiest. Why did I test you like this? Because I'm doing this book for the third time now. And everytime I get stuck at a. I focus at b1 as initial move and than it is too difficult to solve by head. For the other ones I developed a feeling from previous times. Even not blessed with unkx80's memory capacibilities. So why no feeling for problem a. Because of the false solution, may be. Why false? Because it gives white a sente move along the edge. Click Here To Show Diagram Code `[go]$$Bc 2@a,7@b: ko $$ \| . . . . . . . $$ \| . 3 . . . . . $$ \| 5 a X X . . . $$ \| . X . X . . . $$ \| . 4 9 O X X . $$ \| O . O b O X . $$ \| . 1 6 8 O X . $$ +---------------[/go]` above is not attractive for B so he plays Click Here To Show Diagram Code `[go]$$Bc w gets 2 in for free $$ \| . . . . . . . $$ \| . 2 X X . . . $$ \| . X O X . . . $$ \| . 3 . O X X . $$ \| O . O . O X . $$ \| . 1 . . O X . $$ +---------------[/go]` Lesson learnt: stick to Kageyama's fundamentals: first try is to reduce eyespace. Helps also in problem c.